Valve block for fluid-pressure tools



Dec. 17, 929. E. w. STEVE'N'S 1/ 1,739,92

VALVE BLOCK FOR FLUID PRESSURE TOOLS v Filed July 17, 1925 Edward W. Sfevens I I b INVENTOR.

i y 7 JM hs A TTORNEX Patented Dec. 17, 1929 UNITED STATES titan? PATENT orrica EDWARD W. STEVENS, OF DETROIT, MICHIGAN, ASSIGNOR TO CI-ITCAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y., A. CORPORATION OF NEW JERSEY I VALVE BLOCK FOR FLUID-PRESSURE TOOLS Application filed July 17, 19251 Serial N6. 44,166.

This invention relates to machines operated by fluid pressure, particularly portable pneumatic hammers having an automatic distributing valve disposed in an open ended Valve case. A hammer of this general type is disclosed in my copending application Serial No. 448,293 filed February 28, 1921. The present invention may be considered in certain respects in the nature of an improvement on the structure shown in the above named application.

With an open ended valve case there is always the chance of delay in assembling the tool due to the valve falling out of its case, or slipping part way out of its case and becoming wedged as the valve case is forced home. Damage to the parts sometimes results. It is also common practice to provide a spacing member such as a washer at the open end of the valve case and difliculty is frequently experienced in getting this spacing member properly disposed in its place.

Among the objects of this invention are to facilitate the insertion and removal of the valve parts of a fluid pressure tool, to avoid delays incident to the displacement of loose parts, and in general to improve prior devices in the interest of more eflicient and satisfactory service.

In order to illustrate the invention one concrete embodiment thereof is disclosed in the accompanying drawings in which:

Fig. 1 is a fragmentary side elevational view partly in section of a pneumatic ham- ""mer;

Fig. 2 is a longitudinal sectional view on an enlarged scale of the valve box of Fig. 1 ready for insertion;

Figs. 3 and 4 are respectively a sideelevational view and an end elevational view of the valve case lid.

The invention is disclosed as embodied in a pneumatic hammer having a handle A and a cylinder B secured thereto within which reciprocates a free flying piston C operated by pressure fluid admitted through duct a in the handle A under control of an automatic dis tributing valve 5 reciprocable in a valve case 6 secured in a bore a of handle A adjacent cylinder B. A cap nut a abutting annular shoulder 7 of the valve case'and in threaded engagement with the'bore a may serve to close said bore and to securethe valve block in place, the nut a being locked in adjusted position by a pin a held by a spring ring 6.

As clearly shown in Fig. 2 the valve case may comprise a cylindrical member 6 fitting the bore a and having'a differential bore therein to receive the diiferential valve 5 controlling various ports and passages 8 in member 6 which communicate with passages (not shown) in the hammer. One end of cylindrical valve case 6 is permanently closed by a plug member 9 telescoping partly within member 6 and secured in place by a pin 10. A novel form of lid 11, comprising an important part of the present invention, is provided for the other or open'end of the valve case. This lid, shown in side and in end elevation in Figs. 3 and 1 and in section in Figs. 1 and 2, is in the form of a spring ring slit through at 12 and partly slit through at a point 13, which is preferably diametrically opposite slit 12. These slits enable the lid 11 to be reduced in diameter by compression for a purpose presently to be described. The lid has a'radial portion 11 adapted to abut the end of valve case 6 and a portion 11 arranged to telescope within the bore of case 6. The telescoping portion 11 carries ad'- which snaps within a complemental radial recess or groove 14 in case 6 as clearly 1nd1- cated in Figs. 1 and 2. Portion 11 of lid 11 forms an abutment for valve 5 and the interlocking of the lid 11 with member 6 by the provision of the interfitting flange and groove jacent its end a radially projecting flange 11 parts of the valve block in assembled relation when the same is inserted or removed from bore a of the hammer. It is also evident that the portion 11 of the lid has the additional function of a spacing washer for the valve box.

From the above it will be apparent that the present invention enables the parts comprising the complete valve block of a pneumatic tool to be quickly and conveniently assembled and disassembled, that the maintaining of the parts in assembled relation permits the insertion and the removal of valve block as a unit, and that the novel form of lid combines the functions of a washer, spring retainer, and abutment piece for the valve.

While but one form of the invention has been herein shown and described it is to be EDNVARD W. STEVENS.

understood that the invent-ion is not limited to the specific details thereof but covers all changes, modifications and adaptations Within the scope of the appended claims.

I claim as my invention: 1. In a fluid pressure tool, in combination, a valve case having an open end, a valve therein, and a lid for the open end of said case in the form of a split ring having aportion telescopingwithin said case, said case having a recess, and a projection on the telescoping portion of said lid arranged to snap into said recess to retain the lid on said case. 2. In a fluid pressure tool, in combination, a valve case having an open end, a valve therein, and a lid for the open end of said case in the form of a split ring having a cylindrical portion telescoping within said case, a radially projecting flange on the exterior of said portion, said case having a groove into which said flange snaps to hold the lid against accidental removal, said lid being removed by compressing the same adjacent to the split thereby to release said flange from its groove.

3. In combination in a fluid pressure hammer providing a recess, a valve block insertable in and removable from said recess as a unit, said block comprising a hollow cylindrical member adapted closely to fit said recess, a valve reciprocable within said member, a plug member secured to said cylindrical member to close one end thereof and to assist in the insertion and removal of said block, and a lid for the open end of said cylindrical member serving as a retainer abutment for said valve and as a spacing washer for said block, said lid and cylindrical member having telescoping and interlocking parts.

4. A lid for the valve case'of a pneumatic I tool comprising a split spring ring having portions arranged for abutting and for telescoping engagement with the valve case, and a projection on the telescoping portion of said ring to engage a recess in the case, thereby to lock the lid in place.

5. A lid for the valve case-of a pneumatic tool comprising a spring ring arranged to 

